| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Hydrangeaceae | Hydrangea arborescens | Smooth Hydrangea, Northern Wild Hydrangea, Sevenbark | Forests, especially around rock outcrops and along streambanks. | NJ, s. NY, OH, IN, IL, MO, and se. KS south to e. NC, c. SC, c. GA, Panhandle FL, s. AL, LA, and OK. |  |
| Hydrangeaceae | Hydrangea barbara | Climbing Hydrangea, Woodvamp, Decumary | Swamp forests and bottomlands, moist forests in the mountains. | Se. VA south to FL and west to LA, s. AR, and e. TX (Singhurst, Keith, & Holmes 2005), inland to nw. SC, se. TN, and w. TN. | |
| Hydrangeaceae | Hydrangea cinerea | Ashy Hydrangea, Southern Wild Hydrangea | Rocky forests and rock outcrops, roadbanks, perhaps strictly or mostly associated with mafic or calcareous rocks. | Sw. NC, c. IN, c. IL, and c. MO south to n. SC, sc. AL, and c. AR. |  |
| Hydrangeaceae | Hydrangea macrophylla | Bigleaf Hydrangea, Mophead Hydrangea, Hortensia | Disturbed areas, suburban woodlands. | Native of Japan. Reported for AR (Serviss et al. 2017). | |
| Hydrangeaceae | Hydrangea paniculata | Panicle Hydrangea | Persistent after cultivation at old home-sites, sometimes appearing naturalized. | Native of e. Asia. |  |
| Hydrangeaceae | Hydrangea quercifolia | Oakleaf Hydrangea, Greybeard, Old Man's Beard | Native in hammocks, moist forests, also in disturbed areas, thickets, or forests adjacent to urban or suburban areas. | C. and sw. TN, south through w. GA, AL, and MS to Panhandle FL and e. LA; scattered elsewhere as a remnant or escape from cultivation. Boufford & Wood (1977) described a purportedly native occurrence in nw. SC, but it seems possible that this is an escape from cultivation (R. Clark, pers. comm.). This southeastern native is a spectacular garden plant, frequently planted, and sometimes persisting or possible escaping. |  |
| Hydrangeaceae | Hydrangea radiata | Snowy Hydrangea, Silverleaf | Rocky forests and rock outcrops, often common and conspicuous on roadbanks. | A Southern Appalachian endemic: sw. NC (in the valley of the French Broad River and to its southwest), nw. SC, ne. GA, and se. TN, with outliers (perhaps escaped from cultivation?) in Stokes County, NC and Calhoun County, SC |  |
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